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Taiwan Semiconductor Corporation SMAJ14CH
- Part No.:
- SMAJ14CH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ14CH.pdf
- Description:
- TVS DIODE 14VWM 25.8VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,696
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Product details
Overview
SMAJ14CH from Taiwan Semiconductor is a unidirectional 400W transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, with 14V working stand-off voltage (VWM), 15.6–19.1V breakdown voltage (VBR), and 25.8V clamping voltage (VC) at 15.5A peak pulse current. It delivers fast response (<1.0ps), low leakage (<1μA @ VWM), and AEC-Q101 qualification for automotive-grade surge protection in DC/DC converters and power supplies.
For engineers reviewing the SMAJ14CH datasheet, SMAJ14CH pinout, SMAJ14CH application, or SMAJ14CH equivalent, this page provides verified electrical parameters, clamping behavior under 10/1000μs transients, ISO 7637-2 compliance details, and direct alternatives for board-level ESD/surge hardening in automotive and industrial power systems.
Technical Context
The SMAJ14CH operates as a unidirectional avalanche diode, triggered when reverse voltage exceeds its 15.6–19.1V breakdown range at 1mA test current. Its glass-passivated junction ensures stable VBR tolerance and low leakage (<1μA at 14V), while its 25.8V clamping voltage limits downstream circuit stress during 400W (10/1000μs) transients.
Designed for automotive environments, it meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b immunity requirements and supports operation from –55°C to +150°C junction temperature. The DO-214AC package enables automated placement and complies with J-STD-020 Level 1 moisture sensitivity and JESD 201 Class 2 whisker resistance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 14 V - Maximum continuous reverse operating voltage before conduction begins |
| VBR min/max | 15.6 V / 19.1 V - Breakdown occurs within this range at 1 mA, defining turn-on threshold tolerance |
| VC @ IPPM | 25.8 V - Clamped voltage across device at 15.5 A peak pulse, limiting protected circuit stress |
| PPPM | 400 W - Peak pulse power handling per 10/1000μs waveform, derated above 25°C ambient |
| IR @ VWM | <1 μA - Reverse leakage at rated stand-off voltage, minimizing standby power loss |
| TJ max | +150 °C - Maximum junction temperature, enabling use in under-hood automotive locations |
| Package | DO-214AC (SMA) - Surface-mount outline with cathode band marking, compatible with standard reflow profiles |
Pinout & Package
DO-214AC (SMA) package: molded plastic case with matte tin-plated leads, polarity indicated by cathode band; weight ≈0.060 g; UL 94V-0 rated compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential side (e.g., ground or return path) in unidirectional configuration |
| Cathode | Reverse-biased clamping terminal | Connected to protected line (e.g., 14V rail); conducts during overvoltage to shunt energy to ground |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics per stress-test requirements including temperature cycling, HTRB, and ESD |
| Clamping ratio VC/VBR | ~1.37 (25.8V / 18.8V typ), indicating tight voltage control during surge events |
| Response time | <1.0 ps - Enables suppression of nanosecond-scale ESD and fast transients before IC damage occurs |
| ISO 7637-2 compliance | Meets Pulse 1 (inductive load dump), Pulse 2a/2b (switching transients), and Pulse 3a/3b (line impedance coupling) |
| Moisture sensitivity | Level 1 per J-STD-020 - No floor-life limitation; safe for standard SMT assembly without baking |
Applications
| Automotive Power Rail Protection | Industrial DC/DC Converter Input |
|---|---|
Use Scenario: Protecting 12V battery-fed ECUs against load dump and alternator transients in passenger vehicles. IC Role / Device Role / Timing Role: Unidirectional TVS placed between battery rail and ground, clamping spikes up to 400W (10/1000μs). Use Value: Limits voltage to ≤25.8V during ISO 7637-2 Pulse 1 (−150V/0.5Ω), preventing MCU and sensor damage. | Use Scenario: Safeguarding input stage of isolated 12V-to-5V DC/DC converters in factory automation controllers. IC Role / Device Role / Timing Role: Primary surge clamp on primary-side input, absorbing repetitive switching noise and lightning-induced surges. Use Value: Withstands 15.5A peak impulse at 25.8V clamping, preserving converter MOSFET gate oxide integrity. |
| LED Driver Supply Line | On-Board Charger Interface |
Use Scenario: Guarding constant-current LED driver inputs against hot-swap and cable discharge events. IC Role / Device Role / Timing Role: Standoff-rated TVS on 14V supply line, activated only during >15.6V overvoltage conditions. Use Value: Sub-1μA leakage at 14V avoids efficiency loss; fast <1ps response prevents LED string latch-up. | Use Scenario: Front-end protection for bidirectional OBC communication lines interfacing with 12V vehicle network. IC Role / Device Role / Timing Role: Unidirectional clamp referenced to chassis ground, suppressing negative-going transients on power interface pins. Use Value: AEC-Q101 qualification ensures reliability across 10,000+ thermal cycles in OBC under-hood mounting. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ14AHE3/5BT | Lower VBR range (15.6–17.2V), tighter tolerance; same VWM (14V), slightly lower VC (23.2V) | Better suited for designs requiring tighter clamping consistency and lower let-through voltage | Select SMAJ14AHE3/5BT when VBR matching and reduced clamping variance are critical for margin-sensitive rails |
| 1.5SMC14A | Same VWM (14V), higher PPPM (1500W), larger DO-214AB (SMB) package, non-AEC-Q101 | Higher power handling but lacks automotive qualification and surface-mount compatibility with SMA footprint | Choose 1.5SMC14A only for non-automotive, high-energy surge scenarios where PCB space allows SMB and qualification is not required |
Compared with SMAJ14CH, SMAJ14AHE3/5BT offers improved VBR consistency and lower clamping, while 1.5SMC14A trades automotive compliance and compactness for higher pulse power-making SMAJ14CH optimal for space-constrained, AEC-Q101–mandated 12V/14V rail protection.
Availability
SMAJ14CH is available at Aetrix Electronics and suitable for automotive power management, industrial DC/DC converter input protection, and LED driver supply line hardening requiring stable component supply and full traceability.
Supply support for SMAJ14CH includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Taiwan Semiconductor Corporation (TSC) is a vertically integrated analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, specializing in TVS diodes, rectifiers, and power devices since 1979.
The SMAJ series was developed specifically for AEC-Q101–compliant transient suppression in automotive 12V/24V systems, emphasizing robust clamping, fast response, and process-controlled VBR uniformity across voltage grades.
FAQ
What is the clamping voltage of SMAJ14CH and how is it measured?
The SMAJ14CH has a maximum clamping voltage (VC) of 25.8 V, measured at 15.5 A peak pulse current using a 10/1000 μs waveform per IEC 61000-4-5. This value represents the upper limit of voltage seen by downstream circuitry during a standardized surge event, ensuring protection of 15V-tolerant components. The clamping performance is guaranteed across the full operating temperature range (–55°C to +150°C).
Is SMAJ14CH suitable for bidirectional transient suppression?
No, SMAJ14CH is a unidirectional TVS diode intended for suppression of negative-going transients on positive rails. For bidirectional protection, Taiwan Semiconductor specifies the SMAJ14CH variant with "CAH" suffix (e.g., SMAJ14CAH), which features symmetrical breakdown in both directions. Using SMAJ14CH in bidirectional configurations risks failure during positive overvoltage events.
Does SMAJ14CH meet automotive qualification standards?
Yes, SMAJ14CH is AEC-Q101 qualified and tested per the full stress-test schedule including HTGB, HTRB, temperature cycling, and ESD. It also meets ISO 7637-2 Pulse 1, 2a, 2b, 3a, and 3b requirements, making it suitable for front-end protection in engine control units, body control modules, and ADAS power domains.
What is the maximum peak pulse current SMAJ14CH can handle?
SMAJ14CH supports a maximum peak impulse current (IPPM) of 15.5 A under the standard 10/1000 μs double-exponential waveform. This rating assumes TA = 25°C and is derated linearly above that ambient temperature per the manufacturer's pulse derating curve (Fig.2). At 105°C ambient, IPPM drops to approximately 10.2 A.
How does the DO-214AC (SMA) package of SMAJ14CH compare to SMB or SMC packages?
The DO-214AC (SMA) package of SMAJ14CH measures 4.5 × 2.7 × 2.1 mm and offers higher power density than DO-214AA (SMA-like but smaller) while maintaining compatibility with high-speed pick-and-place equipment. Compared to DO-214AB (SMB) and DO-214AB (SMC), SMA provides lower thermal resistance than SMB but less peak power capability than SMC-making it ideal for 400W-class TVS applications where board space is constrained.
SMAJ14CH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AC, SMA
- Series:
- SMAJ
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 14V
- Voltage - Breakdown (Min):
- 15.6V
- Voltage - Clamping (Max) @ Ipp:
- 25.8V
- Current - Peak Pulse (10/1000µs):
- 15.5A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ14CH FAQ
1.How can I place an order for SMAJ14CH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ14CH on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for SMAJ14CH reliable?
The price and inventory of SMAJ14CH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ14CH is usually 5 days.
3.What payment methods are accepted for SMAJ14CH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ14CH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ14CH?
SMAJ14CH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ14CH order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for SMAJ14CH?
For technical support, including SMAJ14CH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ14CH requirements.
6.How does Aetrix verify that SMAJ14CH is sourced from the original manufacturer or authorized distributors?
All SMAJ14CH products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SMAJ14CH meets industry standards.
7.What is the process for return or replacement of SMAJ14CH?
All SMAJ14CH units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ14CH, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The SMAJ14CH part is unused and in its original packaging.
Return procedure for SMAJ14CH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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